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Frankfurt am Main [u.a.]: Lang, 1993
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New York, NY: AMS Press, 1966
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New York: Columbia Univ. Press, 1924
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Stuttgart: Metzler, 1978
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New York [u.a.]: Lang, 1986
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New York, NY: Columbia University Press, [1928] ; [Online-Ausg.]
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New York, NY: Columbia University Press, [1924] ; [Online-Ausg.]
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JSTOR, 1949
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JSTOR, 1946
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JSTOR, 1945
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JSTOR, 1936
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JSTOR, 1937
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JSTOR, 1929